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    <!-- 题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
    函数名：permutation
    参数：需要排列组合的字符串
    返回值：字符串的所有排列组合数组
    例如：permutation("abc") 返回 ["abc", "acb", "bac", "bca", "cab", "cba"] -->

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